Genetic divergence analysis in gladiolus (Gladiolus grandiflorus)



The present investigation was carried out to assess the extent of genetic variability, heritability, genetic advance and genetic divergence using 33 gladiolus (Gladiolus grandiflorus Hort) genotypes with 16 characters. Moderate to high GCV and PCV were recorded for almost all the characters under study emphasizing the existence of variation in the population. All the characters (except number of days required for spike initiation, number of days required for first floret opening and number of florets/spike) showed high heritability along with higher/moderate genotypic coefficient of variation and genetic advance indicating that most likely the heritability was due to additive gene effects and the genotypes under study were highly diverse and of great potential with regard to these characters, and therefore, these are more reliable for effective phenotypic selection. The inter-cluster average D2 value was maximum (25.54) between cluster II and VI followed by between cluster V and cluster VI (24.36). The minimum inter cluster distance was obtained between cluster I and cluster III (12.34), indicated that genotypes of cluster I and cluster III are very close to each other. The clustering pattern showed that genotypes of different geographical areas were clubbed in one group and also the genotypes of same geographical area were grouped into same cluster as well as in different cluster indicating formal relationship between geographical diversity and genetic diversity.


D2 analysis, GCV, Genetic advance, Heritability, PCV

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